Watchcase



Feb. 4, 1941.

WATCHCASE F. MARTI I 2,230,330

Filed Aug. 29, 1958 FWQ/"Z Z In Men 7 dwwwg Patented Feb. 4, 1941 2,230,330

UNITED STATES PATENT OFFICE WATCHCASE Fritz Marti, La Chaux de Fonds, Switzerland Application August 29, 1938, Serial No. 227,422 In Switzerland July 16, 1938 3 Claims. (CI. 5888) This invention relates to water-tight watchother by warm pressing. The spring leaf 49 cases, and more particularly to watchcases comwhich seats again in a recess 48 of the back is prising a case body, a back and an elastic packcovered by the bottom 40 of the exterior part of mg disposed therebetween, whereby an elastic the case, and the claws 52 of the bent up ends device presses said parts uniformly against each of said spring penetrate into grooves 53 of the 5 other. interior part 46, 41.

The object of the invention resides in the pro- In the modification of Figure 6, however, the vision of a watchcase of the above stated type, interior part of the case body, comprising the wherein a leaf spring secured to the case body metal frame 66 and the glass 61, presents a botresiliently engages against the back of the case. tom 60 fixed to the frame by a locking joint, and

The drawing illustrates by way of example one the back 64 is disposed outside said bottom and embodiment and two modifications of the inis pressed by a leaf spring 69 against an elastic vention. packing seated in the exterior part 65 of the case Figure 1 is a plan view of the embodiment body, said leaf spring being seated in a recess 68 of showing a wrist-watch case. said back and having its ends bent up and in- 15 Figure 2 is a plan view of the bottom side and wardly to form claws 12 which engage in grooves Fig. 3 a lateral elevation of said case. 13 of said exterior part.

Figure 4 is a section along the line 4-4 of Fig. I claim: 1, in a bigger scale than before. 1. A water-tight watchcase having in combina- Figures 5 and 6 are similar sections as in Fig. 4, tion a case body composed of at least one part 20 showing two modifications. and forming at its bottom a circumferential The wrist-watch case represented in Figures 1 groove, an elastic packing inserted in said cirto 4 consists of a case body and a back 24. The cumferential groove, 2. back bearing against said case body is composed of an exterior part and packing and a spring leaf extending across said 20 an interior part comprising a metal frame 26 back and resiliently engaging thereagainst, the and an unbreakable glass 21. The border of the elongated ends of said spring being bent up and glass is extended to cover the sides of the frame inwardly and adapted to engage with the case 26 and is ultimately fixed to the latter by warm body, whereby said packing is uniformly pressed pressing. by the back and forced into close contact with 30 The back 24 has on its outer face a longitudithe case body.

nal and rectangular recess 28 in which the mid- 2. A water-tight watchcase having in combidle portion of a spring leaf 29 is disposed, the nation a case body composed of an exterior part ends 30 and 31 of the latter being bent upwardly provided with a top border and with external and presenting claws 32 which penetrate into grooves, and of an interior part comprising a grooves 33 of the exterior part 25. The back 24 frame and an unbreakable glass fast to said presents on its interior side and along the cirframe and bearing against said top border, said oumference thereof an edge 34 which presses interior part forming at its bottom a circumlnto a ring 35 of plastic material, for instance ferential groove between frame and glass, an plexi-gum, fitted in a groove provided between elastic packing inserted in said circumferential the inferior border of the frame 26 and the ingroove, a back bearing against said packing and 40 ferior border of the glass 21. having a recess on its outer face, and a spring If the spring 29 is in the position shown on leaf extending across said back within said rethe drawing, the edge 34 of the back 24 will be cess and resiliently engaging thereagainst, the strongly applied against the elastic ring 35 and, elongated ends of said spring being bent up and at the same time, the interior part including inwardly and adapted to engage the external 45 the frame 26 and glass 21 will be pressed against grooves on the exterior part of the case body, the top border of the exterior part 25 in which whereby said packing is uniformly pressed by the manner an excellent tightness of the watchcase back and forced into close contact with the inis effected. terior part which, at the same time, is pressed In the modification of Figure 5, the watchcase against the top border of the exterior part of 0 consists again of a case body and a back 44. The the case body. exterior part 45 of the case body is provided with 3. A water-tight watchcase having in combia bottom 40 fixed thereto by a locking joint, and nation a case body composed of an exterior part the interior part comprises again a metal frame having a bottom locked thereto and a top border, 46 and an unbreakable glass 41 fixed to each and of an interior part comprising a frame and. 55

resiliently engaging thereagainst, said spring being entirely covered by the exterior part, and its elongated ends being bent up and inwardly and adapted to engage the external grooves of the interior part of the case body, whereby said packing is uniformly pressed by the back and forced into close contact with said interior part.

FRITZ MARTI. 

